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REVENUE RECOGNITION - Narrative (Details)	9 Months Ended
	Sep. 28, 2025
Loyalty Program
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Customer loyalty program liability, expiration period	180 days

X

- Definition

Customer Loyalty Program Liability, Expiration Period

+ References

No definition available.

+ Details

Name:	sg_CustomerLoyaltyProgramLiabilityExpirationPeriod
Namespace Prefix:	sg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=sg_LoyaltyProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: